Namecoin rebooted development about a year ago and we are working on adding the following Tor related functionality:

Hybrid UTXO+SPV lightclients;

floating domain prices and non-trivial renewal fees;

and transaction anonymity (possibly via CoinJoin or Zerocash).

We were planning on approaching the project regarding deeper integration in 2015 or 2016. However, Tor our is one of our most important use cases and we can deliver a fully capable, UTXO based lightclient relatively quickly.

The above feature list and timeline are based on informal discussions with Tor developers. Waiting for the above features mainly improves UX and makes it easier for domain owners to purchase domains anonymously. We are aware of recent research regarding the use of Bitcoin SPV clients over Tor and are working on the SPV threat model for Namecoin (which is slightly different).

It is also not yet clear what the best method is for transaction anonymity. We will support CoinJoin and similar techniques soon, however, Zerocash may provide a more robust solution. We will adopt Zerocash or a similar solution once a clear winner emerges.